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 return a + b;
};
var myObject = {
 value:3,
 getValue:function(){
  return this.value;
 }
};
myObject.double = function(){
 var that = this;
 var helper = function (){
  //add·½·¨ÄÚµØthisÖ¸Ïòwindow¶ÔÏó£¬Ó¦¸ÃËãÊÇjavascriptÉè¼Æ´íÎó
  //ËùÒÔÕâÀïÓÃÒ»¸ö¾Ö²¿±äÁ¿Ö¸ÏòÄÚ²¿·½·¨²ÎÊý
  that.value = add(that.value,that.value);
 };
 helper();
};
myObject.double();
document.writeln(myObject.getValue());


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{
  var Days = 1; //´Ë cookie ½«±»±£´æ 1 Ìì
  var exp  = new Date();    //new Date("December 31, 9998");
  exp.setTime(exp.getTime() + Days*24*60*60*1000);
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